Pipe coupling



FIG. 1 is an isometric view a pipe coupling showing out new design;

FIG. 2 is a top view of the design for the pipe coupling shown in FIG. 1;

FIG. 3 is a bottom view of the design for the pipe coupling shown in FIG. 1;

FIG. 4 is a left side view of the design for the pipe coupling shown in FIG. 1, the right side view being a mirror image thereof;

FIG. 5 is a front view of the design for the pipe coupling shown in FIG. 1; and,

FIG. 6 is a rear view of the design for the pipe coupling shown in FIG. 1.

The broken lines shown in the drawings illustrate portions of the pipe coupling that form no part of the claim. 

CLAIM We claim the ornamental design for a pipe coupling, as shown and described. 